Answer :

Answer:

T6=23

Step-by-step explanation:

we know that

S6-S5=T6

so 78-55=23= T6

so T6=23

OR

Sñ=n/2(2a+(n-1)d)

given S6=78

6/2(2a+5d)=78

2a+5d=26 :eq1

similarly

S5=5/2(2a+4d)=55

2a+4d=22:eq2

subtract 1 and 2 EQ

d=4

by puting value of d in any eq we get

a=3

now T6=a+(n-1)d

T6=23

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