Question

How many terms are there in the AP 1, 3, 5,......81??

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Answer 1

Answer:

an = a+(n-1)d

81= 1+(n-1)2

80 = (n-1)2

40 = n-1

n= 41

Therefore, total number of terms in this ap is 41

Step-by-step explanation:

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Answer 2

Answer:

an=81

a=1

d=2

n=?

81=1+(n-1)2

81-1/2=(n-1)

40=n-1

n=40+1

n=41

so 41 terms

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