Which of the following statement is correct?
I. The value of 100² - 99² + 98² – 97² + 96² - 95² + 94² – 93² + …….. + 22² – 21² is 4840.
II. The value of

Next number in the series 1, 50, 100, 5000, 10000, ___ is :

On simplification, 1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 +  _____+ 111, we get

The sum of 21 + 22 + 23 + .....+ 50 is

On simplification 1 – 2 + 3 – 4 + 5 – 6 - - - - + 101, we get

1 + 2 + 3 +………+ 50 equals

If in an A.P., the pᵗʰ term is q and the (p + q)ᵗʰ term is 0, then the qᵗʰ term is:

If in an A.P., Sₙ = qn² and Sₘ = qm², where Sᵣ denotes the sum of first r terms of the A.P., then $$S_q$$​ equals:

The value of $$\frac1{0.8} + \frac1{0.08} + \frac1{0.008} + …….$$​Up to the seventh term is__________.

​How many terms are there in 2, 4, 8, 16, ..., 1024?

Next number in the series 1, 50, 100, 5000, 10000, ___ is :