Answer:
The 78th term is 623
Step-by-step explanation:
Given:
a₁ = 7; a₂ = 15; a₃ = 23 and so on.
n = 78
To Find:
a₇₈ = ?
Now, Common Difference d
d = a₂ - a₁ = 15 - 7 = 8
d = a₃ - a₂ = 23 - 15 = 8
Here, The Common Difference is same everywhere.
So,
aₙ = a + (n - 1) d
a₇₈ = 7 + (78 - 1) × 8
a₇₈ = 7 + (77) × 8
a₇₈ = 7 + 616
a₇₈ = 623
Thus, The 78th term is 623
-TheUnknownScientist 72
