Question

a monkey asend a greased pole 21m high in first minute he asend 6m and in next minute he asend 5m if he continues this process how many minutes will be reach the top
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Answer 1

Answer:

Brainly answer : 6 minutes

Step-by-step explanation:

6 + 5 +4 +3 + 2 + 1 = 21 m

Answer 2

Sn of the A.P. is 21

a=6

d=-1

therefore

21=n/2(a+(n-1)d

42=n(6+1-n)

n²-7n+42=0

now solve this equation and get the value of n

i.e the no. of minutes required

hope this helped you