Question

Q.N0.13 Find the 9 th term of the following sequence (i) − 45​ ,− 41​ , 43​ ,… (ii) 51​ , 251​, 1251​ ,… (iii) 1,7,13,19,… (iv) 32​ , 34​ , 38​ , 316

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Answer 1

1. 77

2.390626

3.25

4. I dont know

Explanation:

i)T9 = (-1)^(9+1) * (4*9 + 41)

T9 = (-1)^10 * (36 + 41)

T9 = 1 * (77)

T9 = 77

ii) T9 = 5^(9-1) + 1

T9 = 5^8 + 1

T9 = 390625 + 1

T9 = 390626(Not sure about this one)

iii)There is a difference of 6 in each of the values.

so 19+6=25

iv)The fourth one doesnt have a pattern