Question

give the proper answer for the question number 55 for 10 CBSE arithmetic progression lesson in maths

Answer 1

a.p.= 13,19,25
a= 13 , d = 19-13 = 6
a.p.= 69,68,67
a = 69, d= -1
a1=a2
a+(n-1)d = a+ (n-1)d
13+(n-1)6 = 69+(n-1)-1
13+6n-6 = 69-n+1
7n = 63
n= 63/7 = 9

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