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Find the average of first 21 multiples of 21?1). 2312). 2413). 214). 11 |
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Answer» First 21 multiples of 21 are - 21, 42, 63 …. 441 ⇒ AVERAGE of odd number of consecutive terms is always equal to the value of the middle term ⇒ If there are N number of consecutive terms, ⇒ Average = [(n + 1)/2]th term ⇒ Here n = 21 ∴ Average = [(21 + 1)/2]th term = 11th term ⇒ 11th term will be 11th multiple of 21 = 21 × 11 = 231 |
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