Solution: (c)

The given number series question is based on the following pattern:

\(\displaystyle 2+1\times 11=2+11=13\)

\(\displaystyle 13+2\times 11=13+22=35\)

\(\displaystyle 35+3\times 11=35+33=68\)

\(\displaystyle 68+4\times 11=68+44=112\)

\(\displaystyle 112+5\times 11=112+55=167\)

Solution: (d)

The pattern of the number series question is :

\(\displaystyle 650-{{7}^{2}}=650-49=601\)

\(\displaystyle 601-{{6}^{2}}=601-36=565\)

\(\displaystyle 565-{{5}^{2}}=565-25=540\)

\(\displaystyle 540-{{4}^{2}}=540-16=524\)

\(\displaystyle 524-{{3}^{2}}=524-9=515\)

Solution: (b)

The given number series question is based on the following pattern:

15 – 5 = 10;  35 – 15 = 20

75 – 35 = 40;  155 – 75 = 80

Now  ? = 155 + 160 = 315

Solution: (d)

The given number series question is based on the following pattern:

\(\displaystyle 688-472=216={{6}^{3}}\)

\(\displaystyle 472-347=125={{5}^{3}}\)

\(\displaystyle 347-283=64={{4}^{3}}\)

\(\displaystyle 283-256=27={{3}^{3}}\)

\(\displaystyle ?=256-{{2}^{3}}=256-8=248\)

Solution: (a)

The given number series question is based on the following pattern:

\(\displaystyle 1\times 1=1\)

\(\displaystyle 1\times 2=2\)

\(\displaystyle 2\times 3=6\)

\(\displaystyle 6\times 4=24\)

\(\displaystyle 24\times 5=120\)