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Ex 5.2, 15 - Chapter 5 Class 10 Arithmetic Progressions
Last updated at May 29, 2018 by Teachoo
Transcript
Ex 5.2 ,15 For what value of n, are the nth terms of two APs 63, 65, 67, and 3, 10, 17, equal 1st AP 63, 65, 67, We know that an = a + (n 1) d Hence, a = 63 d = 65 63 = 2 Putting these in formula an = a + (n 1) d = 63 + (n 1) 2 = 63 + 2n 2 = 61 + 2n Given that nth term of 1st AP = nth term of II AP 61 + 2n = 7n 4 61 + 4 = 7n 2n 65 = 5n 65/5 = n 13 = n n = 13
Chapter 5 Class 10 Arithmetic Progressions
Serial order wise
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