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English and Logical Reasoning Prep GuideLogical ReasoningSeries Completion

Find the wrong term in the series given below: 15, 16, 22, 29, 45, 70,

Options

  1. A22
  2. B70
  3. C29
  4. D16

Correct answer

A. 22

Step-by-step solution

Given series is, 15,16,22,29,45,70, The difference between two terms of the series, aligned & 16-15=1=1^2 & 22-16=6= Not a square term & 29-22=7= Not a square term & 45-29=16=4^2 & 70-45=25=5^2 aligned Here, difference of terms is a perfect apart from 6 and 7. Also, this difference is increasing with value 1. So, there is difference of 1^2, 2^2, 3^2, 4^2 and 5^2 among the terms. By this difference, the new numbers of series we get, 7 ₇₀^ 15+1^2=16 16+2^2=20 20+3^2=29 29+4^2=45 45+5^2=. ~ Here, 20 should come in the

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